?????????????
??????????b??
??????????????У??????????????????????????????????????????????????С????????????????п???????????????
??Pb??????????????????????Fo??????????????????????b= Pb/Fo ??MPa????
??????????????
?????????????????????????????GDP???????????????????2012??????GDP???????????130????????????GDP????????????????????????????????0.7????????????????????????0.5????GDP????1?????????????????0.5???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????7-8.5?????????????????????????????????????????????????????????
?????????????
6??1800??8000 35??
6??1800??8000 80??
6??1800??8000 21??
6??1800??8000 80??
6??1800??8000 65??
8??1800??8000 35??
??????й???40*1800*8m??q420qc????????г????????????
